Fire detector



FIG. 1 is a perspective view of the front, right and top of a fire detector showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof, a right side view being a mirror image thereof; and,

FIG. 5 is a top plan view thereof, a bottom view being a mirror image thereof. 

The ornamental design for a fire detector, as shown and described. 